obama is desperate to rebuild public confidence in it. the nsa says most of the improper data collection involved cell phones that had had been tracking overseas whose owners brought them back into the u.s. without the agency realizing it but in one instance, the nsa intended to track phones in egypt, country code 20 and the computer read area code 202. that's washington, d.c. martin gellman broke the story. >> so it's an innocent mistake. it demonstrates however, the ease of which the nsa either by accidental or can pull in volumes of communications. >> mistakes reflect a tiny fraction of their operations but they say they take every mistake seriously. shepard? >> shepard: wendell goler from martha's vineyard tonight. more people think that the nsa surveillance program will hurt americans than it will help catch terrorists. we conducted a poll last month long before today's revelation. 47 percent said they thought the snooping would hurt. compare that to 41% who believe it would help fight terror. in egypt, the muslim brotherhood's day o